# Relationship history for MSHA mine 3401639

Current hierarchy: **Cimarron County-Ok → Cimarron County → Felt Caliche**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cimarron County → Felt Caliche; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cimarron County-Ok → Felt Caliche; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cimarron County-Ok → Cimarron County; 1988-03-01 to current/open; source msha-controller-operator-history